Extracting multi-channel audio The first step in extracting multi-channel audio is to plan where you want to place the files. DVDxDV will create up to 7 files when you're extracting a movie with multi-channel audio, so it is a good idea to put these files in a separate folder. If you aren't familiar with how to extract a DVD from DVDxDV, read "Extracting video from a DVD" first. The first step in extracting multi-channel audio is to check the preference settings. Select the Preferences option from the DVDxDV menu: This will bring up the Preferences panel:
If it isn't selected already, select the "Audio Settings" tab. This will bring up two options, "Audio Export Precision" and "Export multi-channel audio to AIFF". In order to export multi-channel audio, you must have the "Export to multi-channel audio to AIFF" option selected. This setting will create a separate sound file for each audio channel, see "Understanding multi-channel audio" for information on what each sound file represents. The other important option is "Audio Export Precision". Audio from a multi-channel sound track has greater dynamic range than a typical audio CD. Dynamic range is the difference between the loudest sound and the quietest sound that can be produced. Most film based multi-channel audio is recorded at a very low level, so that sound can be brought up to the maximum level when it is needed. The AC3 sound format allows the audio quality to be maintained across these changes in volume because it has a great deal of dynamic range. The best way to preserve the dynamic range of AC3 is to use the 24 bit option for "Audio Export Precision". Keep in mind that not all video or audio applications support 24 bit audio. For instance, Final Cut Pro supports 24 bit audio while Final Cut Express doesn't. If your software doesn't support 24 bit audio, use the 16 bit setting. After setting the preferences, click Ok to close the panel. Follow the same steps that you used for "Extracting video from a DVD.." to create a new movie. After the extraction is complete, you will have a Quicktime file and one or more AIFF files that contain sound for the individual audio channels.
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